Annulus
Mathematicians call this shape an annulus. We just call it a doughnut. You can make doughnuts many different ways. We prefer to buy them from the local Dunkin’ Donuts. If you’re going to put them in a project though, we suggest something a little less perishable like: Cut a big circle and a smaller circle, and layer them on top of each other, or Cut a little circle out of the center of a bigger circle. That’s the very literal interpretation of the annulus, but there are...
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